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Measurement of the Ratio of Branching Fractions B (B[subscript c][superscript +] → J/ψτ[superscript +]ν[superscript τ]) / B (B[subscript c][superscript +] → J/ψμ[superscript +]ν[subscript μ]

Author(s)
Boettcher, Thomas Julian; Craik, Daniel C; Ilten, Philip J; Weisser, Constantin; Williams, Michael
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Abstract
A measurement is reported of the ratio of branching fractions R(J/ψ)=B(B[subscript c][superscript +]→J/ψτ[superscript +]ν[subscript τ])/B(B[subscript c][superscript +]→J/ψμ[superscript +]ν[subscript μ]), where the τ[superscript +] lepton is identified in the decay mode τ[superscript +]→μ[superscript +]ν[subscript μ]ν[superscript τ]. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb[superscript -1] of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay B[subscript c][superscript +]→J/ψτ[superscript +]ν[subscript τ] at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be R(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.
Date issued
2018-03
URI
http://hdl.handle.net/1721.1/119151
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., et al. “Measurement of the Ratio of Branching Fractions B (B[subscript c][superscript +] → J/ψτ[superscript +]ν[superscript τ]) / B (B[subscript c][superscript +] → J/ψμ[superscript +]ν[subscript μ].” Physical Review Letters, vol. 120, no. 12, Mar. 2018. © 2018 CERN. for the LHCb
Version: Final published version
ISSN
0031-9007
1079-7114

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